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Keyhole morphology monitoring in laser welding using optical coherence tomography
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DOI：10.3788/COL202523.031201.png)
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Abstract
En 中文
Optical coherence tomography (OCT) offers a direct and precise measurement of keyhole depth in laser welding, facilitating its application for quality assurance and control. Nevertheless, in high-speed welding, the keyhole lags behind the processing beam, leading to a reduction in OCT measurement accuracy. In this paper, OCT is utilized to monitor keyhole morphology by employing a scanner to deflect the measuring beam and the keyhole lag is quantitatively analyzed. Bead-on-plate welds were conducted on stainless steel and aluminum alloys at varying welding speeds. Real-time OCT data collection was performed and reconstructed to generate keyhole morphology. The aluminum alloy exhibited fluctuating keyhole morphology and irregular seam surfaces. The determination of the keyhole lag was based on the longitudinal view of keyhole morphology. Results indicated a proportional increase in keyhole lag with welding speed, and this trend was consistent for both materials.
Keywords:
optical coherence tomography
laser welding
keyhole depth
morphology monitoring
keyhole lag.
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